Earthquake resistant structures

About: Earthquake resistant structures is a research topic. Over the lifetime, 1126 publications have been published within this topic receiving 27467 citations.

Underwater Shake Table Tests on Waterfront Structures Protected with Tire Chips Cushion

Abstract: A series of large-scale underwater shaking table tests was performed on a gravity type model caisson protected by a cushioning technique using tire chips (scrap tire derived recycled product). The function of the tire chips cushion is to reduce the load and restricting the permanent displacement of such waterfront retaining structures during earthquakes by exploiting the compressibility, the ductility and the energy absorbing capacity of tire chips. The seismic performance of such earthquake resistant techniques was evaluated by subjecting the soil-structure system into three different earthquake loadings (two actual earthquake records and one synthetic earthquake), and measuring the respective responses. The results demonstrated that the seismic load against the caisson quay wall could be substantially reduced using the proposed technique. In addition, the presence of the protective tire chips cushion could significantly reduce the earthquake-induced residual displacement of the caisson quay wall.

Wind and Earthquake Resistant Buildings: Structural Analysis and Design

Abstract: WIND LOADS Design Considerations Nature of Wind Characteristics of Wind Code Provisions for Wind Loads Wind-Tunnel Engineering Perception of Building Motions SEISMIC DESIGN Building Behavior Seismic Design Concept Uniform Building Code, 1997 Edition: Seismic Provisions ASCE 7-02,IBC 2003,and NFPA 5000:Seismic Provisions Seismic Design of Structural Elements, Nonstructural Components, and Equipment 1997 UBC Provisions Dynamic Analysis Theory Chapter Summary STEEL BUILDINGS Rigid Frames (Moment Frames) Braced Frames Staggered Truss System Eccentric Braced Frame (EBF) Interacting System of Braced and Rigid Frames Outrigger and Belt Truss Systems Framed Tube System Irregular Tube Trussed Tube Bundled Tube Seismic Design CONCRETE BUILDINGS Structural Systems Seismic Design COMPOSITE BUILDINGS Composite Elements Composite Building Systems Example Projects Super-Tall Buildings: Structural Concept Seismic Composite Systems SEISMIC REHABILITATION OF EXISTING BUILDINGS Code-Sponsored Design Alternate Design Philosophy Code Provisions for Seismic Upgrade Building Deformations Common Deficiencies and Upgrade Methods FEMA 356: Prestandard and Commentary on the Seismic Rehabilitation of Buildings Summary of FEMA 356 Fiber-Reinforced Polymer Systems for Strengthening of Concrete Buildings Seismic Strengthening Details GRAVITY SYSTEMS Structural Steel Concrete Systems Composite Gravity Systems SPECIAL TOPICS Tall Buildings Damping Devices for Reducing Motion Perception Panel Zone Effects Differential Shortening of Columns Floor-Leveling Problems Floor Vibrations Seismic Isolation Passive Energy Dissipation Systems Buckling-Restrained Braced Frame Selected References Appendix A Conversion Factors: U.S.Customary to SI Units Index

Comparison between Shape Memory Alloy Seismic Restrainers and Other Bridge Retrofit Devices

Abstract: Strong earthquakes can result in large longitudinal displacements in multiple-frame bridges. This could lead to excessive displacements/openings at the intermediate joints. Bridges with small seat widths are vulnerable to the unseating of their superstructure. Seismic steel restrainers are currently used to limit joint openings in bridges. However, past earthquakes have shown that restrainer cables have limitations in regards to preventing unseating in bridges. Other devices have been proposed to limit joint displacements, including metallic dampers, viscoelastic dampers, and shape memory alloys (SMAs), which are known for their ability to recover their original shape after being deformed. A sensitivity and a case study are conducted using computer simulations to compare the effectiveness of SMA retrofit devices with other devices. Results show that the effectiveness of the devices is a function of characteristics of the bridge frames and the ground motion characteristics. In all cases, the steel restrainer cables were the least effective in limiting joint displacements. The SMA devices have the additional benefit of significantly limiting the residual joint displacement in bridges.

Torsional response of high-rise buildings

Abstract: Ambient and earthquake response records obtained in several southern California high-rise buildings are analyzed. Building translational and torsional natural periods are estimated and compared. Ambient response is found to be an important indicator of earthquake response. Torsional building response resulting from ambient and earthquake excitation was found to be significant. A design spectrum is developed representing a standardized torsional ground motion of El Centro 1940 Earthquake Intensity.